JP4671794B2 - Nonwoven sheet with cleaning action - Google Patents

Description

  The present invention relates to a nonwoven sheet having a cleaning action, and more specifically, since inorganic salts that are non-surfactants are used as a cleaning agent, it is safe for humans and the global environment and has a practically sufficient cleaning action. It relates to the nonwoven fabric sheet which has.

  Conventionally, to clean the living room, kitchen area, bath and toilet floors and floors, as well as sinks, ranges, grills, toilet equipment, ventilation fans, etc., use a cleaning sheet soaked in water or a solid detergent or liquid detergent. , Sponge, etc.) and often cleaned. However, when such a conventional cleaning sheet is used, there is a disadvantage that a detergent must be attached every time, and a cleaning sheet that can be used stably over a long period of time has been demanded.

For example, Patent Document 1 (Japanese Patent Laid-Open No. 11-217354) discloses a sponge-like molded body obtained by adding and mixing a foaming agent to a foam-moldable base material, and foam-molding the molded body. A surfactant-containing sponge-like molded body containing a surfactant therein has been proposed.
However, in such a surfactant-containing sponge, since a surfactant is used as a cleaning agent, it is not friendly to humans and has a problem from the viewpoint of the global environment. Moreover, although such a sponge has no problem in washing dishes and the like, it has a drawback that it cannot cope with high-viscosity oil such as around a gas range or an exhaust fan or persistent dirt such as burnt dirt.
Japanese Patent Laid-Open No. 11-217354

  The present invention combines a cellulose-based pulp or a polyolefin-based synthetic pulp with a powder of an alkaline inorganic salt having a cleaning action, and uses an airlaid method, so that powder falling off is small and flexible, and various uses. It aims at providing the nonwoven fabric sheet which has the washing | cleaning effect | action which can be applied to.

The present invention comprises (a) a heat-adhesive fiber having a fineness of 1.5 to 50 dtex as a main component, and (b) (a) a fineness of 1 to 1 on a web layer by an airlaid method having a basis weight of 10 to 250 g / m ² . 4.4-dtex thermal adhesive fiber 20 to 95% by weight, (b) cellulosic pulp 0 to 50% by weight, (c) 5 to 80% by weight of alkaline inorganic salt powder having a cleaning action [however, , (A) + (b) + (c) = 100% by weight], and a web layer formed by an airlaid method having a basis weight of 20 to 1,000 g / m ² is laminated. ) On the web layer, (c) A web layer similar to the above (a) web layer was laminated and formed into a single sheet as a whole by thermal bonding of these heat-adhesive fibers. of m ^2, about nonwoven sheet having a cleaning action
Here, (b) In the web layer, (d) a polyolefin synthetic pulp having a multi-branch fiber structure obtained by a flash method is used, and (c) a powder of an alkaline inorganic salt having a cleaning action / (d) polyolefin You may make it contain so that it may become weight ratio = 1 / 0.2-1 / 2 of a system synthetic pulp.
In addition, the non-woven fabric sheet having a cleaning action of the present invention preferably further integrates (d) a breathable sheet on one side or both sides in order to improve handling properties and play a role of strength reinforcement.
Examples of the (d) breathable sheet include dry nonwoven fabrics, wet nonwoven fabrics, paper, spunbond nonwoven fabrics, melt blown nonwoven fabrics, plastic nets, perforated films, split yarn cloths, woven and knitted fabrics, and cold chills.

In the present invention, (b) a cellulose-based pulp, or (d) a polyolefin-based synthetic pulp, (c) an alkaline inorganic salt powder, and (a) a heat-adhesive fiber (b) a web layer is formed. In this case, since the airlaid method is adopted, (b) the cellulose-based pulp, or (d) the polyolefin-based synthetic pulp, and (c) the alkaline inorganic salt powder are intertwined in the air stream. (C) Alkaline inorganic salt powder is entangled with the pulp or (d) olefin synthetic pulp. As a result, the (c) alkaline inorganic salt powder is less dropped from the formed (b) web layer. In addition, (b) Cellulose pulp and (d) Polyolefin synthetic pulp in combination with (b) Cellulose pulp in the web layer improve water retention and improve the cleaning action.
In addition, (b) a web layer is formed in advance by the airlaid method, and the above (b) web layer is laminated thereon, so that (c) an alkaline inorganic salt powder is temporarily generated (b) is dropped from the web layer. However, it is not collected by this (b) web layer and falling out of the system. Moreover, the obtained nonwoven fabric sheet is rich in flexibility and excellent in cleaning action.
Moreover, (c) the nonwoven fabric sheet of this invention which laminated | stacked the web layer as an upper layer does not fall out of the powder of (c) alkaline inorganic salt both front and back.
Furthermore, by selecting the fineness of the (i) web layer as the base sheet and (c) the web layer as the upper layer, for example, when there are many rough and hard stains, thick fibers, fine or slime-like When there is a lot of dirt, by selecting appropriately thin fibers, it is possible to obtain a nonwoven fabric sheet for cleaning according to use.
Furthermore, (d) a breathable sheet is laminated and integrated on one side or both sides of a nonwoven sheet composed of [(c) web layer] / (b) web layer / (b) web layer, thereby providing a cleaning action obtained. The handleability of the nonwoven fabric sheet is improved and the strength is reinforced.
Moreover, since the nonwoven fabric sheet | seat which has the washing | cleaning effect | action of this invention is integrated by heat processing, such as a hot-air process or a calender process with a hot roll, it can suppress delamination and the fall-off | omission of alkaline inorganic salt powder.
Furthermore, in the present invention, since alkaline inorganic salts that have a cleaning action and are non-surfactants are used as the cleaning agent, it is gentle to humans and does not affect the global environment.

(A) Web layer (base sheet):
The (a) web layer used in the present invention is mainly composed of a non-woven fabric by an airlaid method having a fineness of 1.5 to 50 dtex and a basis weight of 10 to 250 g / m ² . In addition, although this base material sheet may be bonded between fibers by heat treatment in advance, it is usually the last stage of the manufacturing process of the nonwoven fabric sheet having the cleaning action of the present invention (a) web layer and (b) web. Heat treated together with the layers to bond between the fibers.

  As the heat-adhesive fiber used in (a) the web layer that is the base sheet, a heat-adhesive conjugate fiber is suitable. For example, a core-sheath type in which a low melting point component is a sheath component and a high melting point component is a core component, a side-by-side type in which one is a low melting point and the other is a high melting point component. Examples of the combination of both components of these composite fibers include PP [polypropylene] / PE (polyethylene), PET (polyethylene terephthalate) / PE, PP / low-melting copolymer PP, PET / low-melting copolymer polyester, and the like. . Here, examples of the low-melting point copolyester include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, etc. as a basic skeleton, aromatic dicarboxylic acids such as isophthalic acid and 5-metal sulfoisophthalic acid, adipic acid, and sebacic acid. And a modified copolymer with an aliphatic polycarboxylic acid such as diethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol and the like.

  The melting point of the thermal adhesive component, which is a low melting point component, is usually 110 to 160 ° C., preferably 120 to 155 ° C. When the temperature is less than 110 ° C., the heat resistance of the non-woven fabric is low, so that it lacks practicality in cleaning around the kitchen, particularly when the temperature is relatively high such as a range and a grill. On the other hand, when the temperature exceeds 160 ° C., it is necessary to increase the heat treatment temperature in the nonwoven fabric production process, the productivity is lowered, and not only is not practical, but also the adhesive effect in the hot-pressure integration with the airlaid fiber layer described later cannot be expected. .

The fineness of the heat-adhesive fiber is 1.5 to 50 dtex, preferably 1.7 to 40 dtex. If it is less than 1.5 dtex, when forming a web by the airlaid method, thin fibers tend to be entangled with each other and mixing with other fibers becomes difficult, resulting in a large risk of uneven formation of the texture and occurrence of massive defects. In addition, it takes too much time to elute inorganic salts from the web layer, which is not practical. In the case of a thick fiber, the cleaning / dirt scraping action is increased. On the other hand, in the case of a thick fiber exceeding 50 dtex, the number of fibers is reduced even at the same mixing ratio. Effects such as imparting heat sealability are diminished.
In addition, since the manufacturing method of (a) web layer which is a base material sheet | seat is an airlaid method, it is preferable that the fiber length of a heat bondable fiber is 2-15 mm, More preferably, it is 3-10 mm. When the fiber length is less than 2 mm, the effect of increasing the strength is not sufficient. On the other hand, when the fiber length exceeds 15 mm, the fibers tend to be entangled with each other, leading to deterioration in processability and texture.

  The thermoadhesive fiber may contain various additives. For example, a coloring agent, an antibacterial agent, a deodorant, an antifungal agent, a hydrophilizing agent, and the like can be given.

  The heat-adhesive fiber may be crimped or not, and may be a strand chop. In the case of crimping, both zigzag type two-dimensional crimped fibers and three-dimensional (three-dimensional) crimped fibers such as spiral type and ohmic type can be used.

  Examples of fibers other than these heat-adhesive fibers include PP fibers, PET fibers, PBT fibers, nylon 6 fibers, nylon 6,6 fibers, aromatic polyamide fibers, acrylic fibers, synthetic pulp (for example, Mitsui Chemicals, Inc. ) Multi-branched fibrillar fibers made of PE or PP, such as SWP made from wood), wood pulp, hemp, rayon, viscose fibers, etc. may be mixed within a range not impairing the gist and effect of the present invention. good. In this case, the proportion of other fibers is preferably kept below 30% by weight. If it is 30% by weight or more, not only the strength of the nonwoven fabric and the heat sealability will be affected, but fibers without thermal adhesiveness will easily fall off during actual use.

The basis weight of the (b) web layer to be the base sheet is 10 to 250 g / m ² , preferably 20 to 150 g / m ² . If it is less than 10 g / m ² , (b) the inorganic salt powder present in the web layer will fall off without being captured by the web layer, and the nonwoven fabric will have low strength, causing troubles such as breakage in actual use. easy. On the other hand, if it exceeds 250 g / m ² , not only will there be a tendency that sufficient air permeability necessary as a base material for the airlaid method cannot be secured, but (b) it takes too much time to elute inorganic salts from the web layer, Lack of practicality.
In addition, it is preferable that the air permeability of (a) web layer used as a base material sheet is 2 second or less. The airlaid method is a method in which a fiber layer is formed on a breathable material by ejecting a mixture of fibers and air from the top of the breathable material and drawing air from the bottom by suction. Air permeability is an important requirement. When the air permeability exceeding 2 seconds is poor, the air-laid fiber layer is likely to be non-uniform and the productivity is also deteriorated. The air permeability is preferably 0.5 to 2 seconds.

  The (a) web layer serving as the base sheet may be formed at the same time as the (b) web layer is laminated. For example, the (a) web layer (base) previously prepared and heat-treated by the airlaid method is used. By using the material sheet, the manufacturing process by the airlaid method can be simplified.

(B) Web layer formation and lamination integration:
Next, (b) a web layer containing a powder of cellulose-based pulp or a polyolefin-based synthetic pulp and an alkaline inorganic salt having a cleaning action on the web layer to be the base sheet (b) by the airlaid method. Form. That is, from a single unit or a large number of spray units located on a porous net conveyor, cellulosic pulp, or a mixture of this, a polyolefin synthetic pulp, an inorganic salt powder, and a heat-adhesive fiber, are jetted out. A web layer is formed on the net conveyor while sucking with an air suction portion arranged on the lower surface. At this time, if a web layer to be a base sheet is placed in advance on the net conveyor, a laminate can be obtained at once. Thereafter, hot air treatment and / or hot-pressure calender treatment is applied to the laminate to form an airlaid layer-to-fiber bond and a thermal bond with the substrate to be integrated as a nonwoven sheet.
At this time, since (ii) the heat-adhesive fibers are mixed in the web layer, effects such as fixing of powder, prevention of falling off, and improvement of delamination strength can be expected.

(A) As the heat-adhesive fiber, the above-mentioned heat-adhesive conjugate fiber is particularly suitable. (A) The fineness of the heat-adhesive fiber is 1 to 4.4 dtex, preferably 1 to 3.3 dtex. If it is less than 1 dtex, when forming a web by the airlaid method, thin fibers tend to be entangled with each other and mixing with other fibers becomes difficult, and the risk of non-uniform texture and occurrence of massive defects increases. On the other hand, if it exceeds 4.4 dtex, the number of fibers decreases even at the same mixing ratio, and the effects of capturing inorganic salt powder, preventing falling off, imparting strength, and imparting heat sealability are reduced. Note that (a) the fiber length of the heat-adhesive fiber is the same as (i) the fiber length of the heat-adhesive fiber used in the web layer.
(A) The mixing ratio of the heat-adhesive fibers in the (b) web layer is 20 to 95% by weight, preferably 20 to 90% by weight. If it is less than 20% by weight, it is impossible to secure the effect of capturing, fixing and preventing the inorganic salt powder from being captured. On the other hand, if it exceeds 95% by weight, not only the flexibility of the sheet after heat treatment is lost, but also the surroundings of the inorganic salt powder are covered with many heat-adhesive fibers, which adversely affects the cleaning effect.

The (b) cellulosic pulp used in the (b) web layer plays a role of holding the water of (c) alkaline inorganic salts and holding water during washing.
(B) Cellulose pulp includes pulverized non-wood pulp such as linter pulp and bagasse in addition to wood pulp.
(B) The mixing ratio of the cellulosic pulp in the (b) web layer is 0 to 50% by weight, preferably 0 to 40% by weight. If it exceeds 50% by weight, (b) the tensile strength and delamination strength as a web layer, particularly these strengths when wet, are unfavorable.

Further, (c) alkaline inorganic salts having a cleaning action include alkali metal carbonates, alkali metal bicarbonates, alkali metal borates, alkali metal phosphates, alkali metal silicates, alkali metal oxalates, and the like. It is done. In particular, anhydrous sodium carbonate, sodium carbonate decahydrate (laundry soda), sodium hydrogen carbonate (sodium bicarbonate), sesquicarbonate soda, sodium silicate, sodium perborate, slaked lime and the like are preferable.
These inorganic salts are preferably water-soluble, more preferably water-soluble carbonates, and particularly preferably sodium bicarbonate. In particular, baking soda is suitable because it has deodorizing and deodorizing effects. Here, “water-soluble” means that the solubility at room temperature is 1 g or more per 100 g of water.

Alkaline inorganic salts are not only put into practical use as alkaline assistants for various household and industrial detergents, but may be used by utilizing their own detergency. For example, baking soda, that is, sodium bicarbonate, or sodium bicarbonate has been used as a cleaning agent for a long time, and its effects include (1) sequestering calcium ions and magnesium ions in water or from dirt, (2) Make the cleaning solution alkaline, saponify and hydrolyze soil components such as fats and fatty acids, and (3) maintain a suitable pH for cleaning by buffer action (4 It is said that it contributes to the removal of dirt by exhibiting a surface-active action in the dirt liquid, and (5) the powdery substance shows the action of scraping and polishing. Furthermore, it also has a deodorizing effect due to the inclusion action of malodorous substances and the neutralizing action of acidic substances.
The principle of washing in water is considered to be the effect of neutralization, hydrolysis, etc. of organic substances with weak alkaline inorganic salts.

The average particle diameter of these (b) inorganic salt powders is usually 0.01 to 2 mm, preferably 0.1 to 1 mm.
(C) The mixing ratio of the inorganic salt powder in the (b) web layer is 5 to 80% by weight, preferably 10 to 70% by weight. If it is less than 5% by weight, the cleaning effect is poor. On the other hand, if it exceeds 80% by weight, (b) not only is it difficult to ensure the strength as the web layer, but the powder falls off during production, storage, and transportation, and lacks practicality.

In addition, (c) An enzyme may be further combined with the inorganic salt powder. Examples of the enzymes include proteases effective for protein soils, lipases effective for lipid soils, and degrading enzymes such as amylase effective for starch soils. However, depending on the alkalinity of the alkaline inorganic salt, an alkali-resistant enzyme can be particularly selected.
(C) Inorganic particles as abrasives, such as alumina, silica, graphite, zeolite, titanium dioxide, kaolin, clay, silicon carbide, diatomaceous earth, calcium carbonate, calcium phosphate, aluminum oxide, etc. Can also be used. However, since the abrasive may damage the object, it is necessary to limit the amount of mixing per unit area.

  In addition, it is known that the non-woven sheet having a cleaning action of the present invention can be easily cleaned inside after cooking and has an odor mitigating effect when placed in a tray of a kitchen cooking grill together with water. . This is considered to be due to not only the absorption effect of oil drip from fish and the like, but also neutralizing action of alkaline inorganic salts dissolved in water.

In the (b) web layer of the present invention, (d) a polyolefin-based synthetic pulp may be used in combination with the (b) cellulose-based pulp as the pulp.
Here, (d) the polyolefin synthetic pulp is, for example, a polyolefin solvent in a high temperature, high pressure state, a polymer solvent selected from aliphatic hydrocarbons and / or aromatic hydrocarbons having a boiling point lower than that of water, and A dispersion consisting of water, when rapidly released into the vacuum zone, removes the dispersion at a temperature at which substantially all of the solvent evaporates and does not cause substantial evaporation of water through the nozzle. It is obtained by releasing into the fiber, collecting the polyolefin as a fibrous material dispersed in water, and refining or refining the fibrous material dispersed in water with a surfactant mixed. The method for producing the polyolefin-based synthetic pulp is described in detail in, for example, the claims in the first column of JP-B-52-47049, column 3, line 5 to column 19, line 25. The gist of the present invention, that is, a method for producing a polyolefin-based synthetic pulp composed of fibrillar fibers having a trapping action for hygroscopic powder, is not necessarily limited to these.
As the polyolefin synthetic pulp, those having an average fiber length of 0.5 to 3 mm and an average fiber diameter of 1 to 100 μm can be suitably used.
Moreover, as a commercial item of this polyolefin synthetic pulp, SWP E790, E400, EST-8, E620, UL410, NL490, AU690, Y600, ESS-5, ESS-2, E380, E780 manufactured by Mitsui Chemicals, Inc. , E90, UL415, and the like.

  Since these (d) polyolefin-based synthetic pulps have a multi-branched fiber structure (fibrillated, multi-branched, and have a high specific surface area), (c) they have a feature that is excellent in scavenging of inorganic salt powders. Further, when sprayed onto the base sheet by the airlaid method, the web layer in which (d) the polyolefin synthetic pulp and (c) the inorganic salt powder are integrated in the airflow is uniformly placed on the sheet. It will be.

  (B) The mixing ratio (weight ratio) of (d) polyolefin-based synthetic pulp forming the web layer and (c) alkaline inorganic salt powder is 1 / 0.2 to 1/2, preferably 1 / 0.25. ~ 1 / 1.8. (D) When there is too little polyolefin synthetic pulp, the capture | acquisition function of inorganic salt powder will become inadequate, and it will become easy to fall out of powder. On the other hand, when there are too few inorganic salt powders, the washing | cleaning effect of the nonwoven fabric sheet obtained will be scarce, and it will not become what this invention intends.

In addition to these components, as fibers other than the heat-adhesive fiber, for example, PP fiber, PET fiber, PBT fiber, nylon 6 fiber, nylon 6,6 fiber, aromatic polyamide fiber, acrylic fiber, hemp, rayon, screw You may mix a course fiber etc. in the range which does not inhibit the meaning and effect of this invention. In this case, the proportion of other fibers is preferably kept below 30% by weight. If it is 30% by weight or more, not only the strength and heat sealability of the nonwoven fabric will be affected, but fibers without thermal adhesiveness will easily fall off during actual use.

Incidentally, formed by air-laid method (ii) web layer, typically having a basis weight 20~1,000g / ^{m 2,} preferably 40~750g / ^{m 2.} When it is less than 20 g / m ² , the cleaning effect is poor, and the nonwoven fabric strength and heat seal strength are low, which is not suitable for practical use. On the other hand, if it exceeds 750 g / m ² , it is not preferable because it is too thick and the flexibility becomes poor, and it becomes difficult to form a uniform web by the airlaid method.
The airlaid method for producing the web layer of the present invention is extremely easy to use because of the short length of fibers that can be easily defibrated to a single fiber by air flow, compared to existing dry nonwoven fabric manufacturing methods such as the card method. Not only has a feature that a non-woven fabric having a good texture, that is, a good uniformity can be obtained, but it is possible to form a web all at once while mixing powder, which is suitable for the present invention. In the use of a cleaning sheet, uniformity is an important requirement for the performance that the powder leakage is small and the cleaning effect is large, and it is difficult to obtain with the existing card method nonwoven fabric, spunbond nonwoven fabric and melt blown nonwoven fabric. Moreover, according to this manufacturing method, there is also a merit that the vertical / horizontal strength ratio is close to 1/1.

(C) Web layer (upper sheet)
The non-woven sheet having a cleaning action of the present invention further prevents the powder of the alkaline inorganic salts having a cleaning action (c) present in the (b) web layer from being further removed and enhances functions such as surface abrasion resistance. In order to do this, on the (b) web layer, (c) a web layer formed by an airlaid method having a basis weight of 10 to 250 g / m ² mainly composed of heat-adhesive fibers having a fineness of 1.5 to 50 dtex is laminated. It is preferable to do.
Examples of the (c) web layer serving as the upper layer sheet include the same as the (a) web layer serving as the substrate sheet.
(C) The web layer may be mixed with hydrophilic fibers such as wood pulp, linter pulp, and rayon in order to increase the hydrophilicity of the surface and make the cleaning action smooth. The mixing rate is preferably kept below 50% by weight. When it is 50% by weight or more, the fall of the hydrophilic fiber, the decrease in wet strength, etc. become large, and the practicality is lacking.

The total basis weight of the nonwoven fabric sheet of the present invention comprising the above (a) / (b) or (c) / (b) / (b) is 40 to 1,500 g / m ² , preferably 60 to 1000 g / m. ² . If it is less than 40 g / m ² , the cleaning effect is poor and the strength is low, making it difficult to withstand practical use. On the other hand, in the case of a high basis weight exceeding 1,500 g / m ² , the cleaning effect is less likely to increase proportionally, and the production cost is increased, resulting in lack of commerciality.

(D) Breathable sheet The nonwoven fabric sheet of the present invention may be integrated with other sheets as long as the intention of the present invention is not impaired. For example, if it is integrated with a breathable sheet, when making the nonwoven fabric sheet of the present invention by the airlaid method, it is easy to place the breathable sheet on a net conveyor and deposit the fibers on it. It can be made into a composite sheet.
Examples of the sheet to be integrated include generally known dry nonwoven fabrics, wet nonwoven fabrics, paper, spunbond, melt blow, plastic nets, perforated films, split yarn cloths, coarse knitted fabrics, and cold chills. In addition, a sheet made of a heat-adhesive and water-resistant material is preferable, and it is preferable that the air permeability is large.
(D) The basis weight of the breathable sheet is usually 10 to 200 g / m ² , preferably 10 to 100 g / m ² .
In addition, (d) When the air permeable sheet is a nonwoven fabric, the fineness of the fibers constituting the nonwoven fabric is usually 1 to 11 dtex, preferably 1.5 to 6.6 dtex.
(D) By laminating a breathable sheet on one side or both sides of the nonwoven fabric sheet of the present invention, the handleability can be improved and the strength of the resulting nonwoven fabric sheet can be reinforced.

Heat treatment:
The nonwoven fabric sheet having the cleaning action of the present invention is preferably subjected to a heat treatment on the nonwoven fabric laminate obtained as described above. Examples of the heat treatment include hot air treatment and / or hot pressure treatment.
Among these, the hot air treatment for forming the fiber-to-fiber bond requires a temperature equal to or higher than the melting point of the low-melting component of the heat-adhesive conjugate fiber. However, if the melting point is 30 ° C. or higher than the melting point of the low melting point component, or the melting point of the high melting point component (the core component of the core-sheath type composite fiber or the high melting point component of the side-by-side type composite fiber), the heat shrinkage of the fiber. Is liable to be large, which leads to deterioration of the texture, and in extreme cases, it causes deterioration of the fibers, which is not preferable.
The hot air treatment temperature is usually 110 to 190 ° C, preferably 120 to 175 ° C.

  Further, after the hot air treatment, a hot pressure treatment, specifically, a hot pressure calendar treatment may be added. As a roller used for the calendering treatment, it is preferable to use a pair of metal rollers having a smooth surface or a combination of a metal roller and an elastic roller in order to apply a uniform heat pressure to the whole, but a multi-stage roller may also be used. In addition, an embossing roller with an uneven surface may be used as long as the gist of the present invention is not impaired.

In the case of calendering, the pressure may be applied at any temperature from room temperature (non-heated) to high temperature if it is simply for thickness adjustment. The pressure can be appropriately selected to achieve a desired thickness. The temperature of the roller surface is higher than the melting point of the low-melting component of the heat-adhesive conjugate fiber so as to reinforce the thermal bond between the fibers with a hot-pressure calender and improve strength, surface abrasion resistance, delamination prevention, etc. Temperature is required. However, if the melting point is 30 ° C. or higher than the melting point of the low melting point component, or the melting point of the high melting point component (the core component of the core-sheath type composite fiber or the high melting point component of the side-by-side type composite fiber), the heat shrinkage of the fiber. Not only tends to be large, but also sticks to the roller surface and lacks processability. When the temperature is lower than the melting point, it is a matter of course that the reinforcement between the fibers is not sufficient.
The heat treatment temperature for reinforcing the fiber-to-fiber bond is usually 110 to 190 ° C, preferably 120 to 175 ° C.

  Moreover, if the linear pressure of the calendar process is set to be a uniform contact pressure in the width direction, an arbitrary pressure can be selected. In the case of high pressure, the density, non-woven fabric strength and interlayer strength increase, and the thickness decreases. In the case of low pressure, of course, an adverse effect occurs. If importance is attached to the strength of the nonwoven fabric, a high pressure is preferred as much as possible. If flexibility is important, low pressure is preferable. The linear pressure of the calendar process can usually be arbitrarily selected in the range of 10 to 100 kgf / cm. An arbitrary gap may be provided between the pair of rollers.

In addition, although the thickness of the nonwoven fabric sheet | seat which has the washing | cleaning effect | action of this invention obtained is 0.3-30 mm normally, Preferably it is 0.5-20 mm, The fabric weight of a web layer (40-1500 g / m < ² >). ) And can be set according to the application.
Moreover, the total weight of the nonwoven fabric sheet having a cleaning action according to the present invention to which the breathable sheet is added is usually 40 to 1,800 g / m ² , preferably 50 to 1,500 g / m ² .

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited to these Examples.

Example 1
(A) As a web layer (base sheet), PP (polypropylene) / PE (polyethylene) based composite fiber 11 dtex × 5 mm was formed on the net by an airlaid method so as to be 20 g / m ² . Next, PP / PE composite fiber 1.7 dtex × 5 mm was mixed to 17.5 g / m ² , wood pulp 17.5 g / m ² , and baking soda 100 g / m ² , for a total of 135 g / m ² . (B) A web layer was formed on the (b) web layer by the airlaid method. Further, (c) PP / PE composite fiber 1.7 dtex × 5 mm is mixed as 25 g / m ² and wood pulp is 10 g / m ² as a web layer, and 35 g / m ² in total is airlaid. Formed with. The entire 190 g / m ² airlaid web was heated in a 140 ° C. hot air suction heating furnace and integrated. When the obtained 4 mm thick non-woven fabric was wetted with water and used to clean a domestic bath, it was possible to clean the internal slime and dirt without using a synthetic detergent. For stubborn stains, (a) 11 dtex surface of thick web layer is used, and for soils such as slime, it contains hydrophilic fibers. there were. In addition, the sodium bicarbonate powder contained was very little dropped out during storage and transportation.

Example 2
(A) As a web layer (base sheet), PP / PE composite fiber 20 dtex × 5 mm was formed on the net by an airlaid method so as to be 100 g / m ² . Next, PP / PE composite fiber 1.7 dtex × 5 mm is mixed to 75 g / m ² , wood pulp 75 g / m ² , synthetic pulp (SWP) 40 g / m ² , and baking soda 150 g / m ^2. A total of 340 g / m ² of the (b) web layer was formed on the (a) web layer by the airlaid method. Further, (c) a PP / PE-based composite fiber 11 dtex × 5 mm was formed as a web layer by an airlaid method so as to be 80 g / m ² . The entire 520 g / m ² airlaid web was heated in a 140 ° C. hot air suction heating furnace and integrated. When the obtained non-woven fabric having a thickness of 6.3 mm was wetted with water and used for cleaning the cooking range, the dirt could be cleaned cleanly. For stubborn stains, (a) the surface of the web layer having a fineness of 20 dtex was particularly effective. The contained baking soda powder did not fall off during handling such as storage and transportation.

Example 3
PP / PE composite fiber 3.3 dtex × 51 mm was made into a web by the card method and heat-integrated in a hot air suction heating furnace at 136 ° C. to obtain a thermal bond type dry nonwoven fabric having a basis weight of 15 g / m ² . This dry nonwoven fabric is placed on a net conveyor, and (b) a PET / PE composite fiber 2.2 dtex × 5 mm is formed on the web conveyor (base sheet) by airlaid so as to be 10 g / m ^2. did. Next, PP / PE composite fiber 1.7 dtex × 5 mm is mixed to 30 g / m ² , wood pulp 5 g / m ² , and baking soda 30 g / m ^2, and a total of 65 g / m ² (b) web A layer was formed on the above (a) web layer by the airlaid method. Further, (c) a PET / PE composite fiber 2.2 dtex × 5 mm was formed as a web layer by an airlaid method so as to be 10 g / m ² . A total of 100 g / m ² of the composite airlaid web was heated in a 140 ° C. hot air suction heating furnace and integrated. When the obtained non-woven fabric with a thickness of 2.5 mm was wetted with water and used for cleaning the inside of the grilled fish grill in the cooking range, it was useful for cleaning oil stains and scorching. In particular, since the thermal bond type dry nonwoven fabric is combined and has excellent strength, it is difficult to tear even if caught on the grill net, and there is no problem in the work. In cooking, water is usually placed in the tray of the grill, but it has been found that cleaning after cooking is further facilitated by placing the nonwoven fabric sheet of the present invention in advance in water. This is considered to be due to the absorption effect of oil drip from fish or the like, gravy, and the neutralizing action of baking soda dissolved in water.
The results are shown in Table 1.

<Note>
Wood pulp; Weyerhaeuser, NB416
Synthetic pulp: Mitsui Chemicals, SWP-E790

Since the nonwoven fabric sheet having a cleaning action of the present invention is manufactured by using an airlaid method in combination with a cellulose-based pulp or a polyolefin-based synthetic pulp and a powder of an alkaline inorganic salt having a cleaning action, The inorganic salt powder is a non-woven fabric sheet having a cleaning action that is less likely to fall off and rich in flexibility and can be applied to various applications. Moreover, since it does not contain a synthetic surfactant, it can be said that the cleaning sheet is friendly to humans and the global environment. For this reason, the non-woven sheet having the cleaning action of the present invention is used for cleaning living utensils, kitchen floors, floors and floors such as baths and toilets, and household appliances such as sinks, ranges, grills and toilet equipment, It is useful as a cleaning sheet in a wide range of fields such as industrial use and industrial use.

Claims (5)

(A) Mainly composed of heat-adhesive fibers having a fineness of 1.5 to 50 dtex, and (b) (a) a fineness of 1 to 4.4 dtex on the web layer by an airlaid method having a basis weight of 10 to 250 g / m ² . 20 to 95% by weight of heat-adhesive fiber, (b) 0 to 50% by weight of cellulose-based pulp, and (c) 5 to 80% by weight of powder of alkaline inorganic salt having a cleaning action [where (a) + (B) + (c) = 100% by weight], and a web layer by an airlaid method having a basis weight of 20 to 1,000 g / m ² is laminated and integrated as a whole by thermal bonding of these thermally adhesive fibers. A non-woven sheet having a cleaning action, having a sheet weight of 40 to 1,500 g / m ² . Furthermore, the nonwoven fabric sheet which has a washing | cleaning action of Claim 1 formed by laminating | stacking the web layer similar to said (b) said web layer on (b) web layer. (B) In the web layer, (d) a polyolefin synthetic pulp having a multi-branch fiber structure obtained by a flash method is used. (C) Alkali inorganic salt powder having a cleaning action / (d) Polyolefin synthetic pulp ( The nonwoven fabric sheet having a cleaning action according to claim 1 or 2, which is contained so that the weight ratio is 1 / 0.2 to 1/2. (D) The nonwoven fabric sheet having a cleaning action according to any one of claims 1 to 3 , wherein the breathable sheet is further laminated and integrated on one side or both sides. (D) breathable sheet has a dry nonwoven fabric, wet nonwoven fabric, paper, spunbonded nonwoven fabric, meltblown nonwoven fabric, plastic net, a perforated film, a split yarn cloth, the cleaning action of the textile fabric or claim 4 wherein the cheesecloth, Nonwoven sheet.